Quick answers
- Does Louis D. Swartz accept Medicare assignment?
- Yes. Medicare's clinician data says Louis D. Swartz accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Louis D. Swartz see?
- In 2024, CMS data shows 700 Original Medicare patients and 3,421 services for Louis D. Swartz. This counts Original Medicare only and measures volume, not quality.
- What is Louis D. Swartz's NPI number?
- 1619056421. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Louis D. Swartz, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 700 |
|---|---|
| Services billed to Medicare | 3,421 |
| Different services or procedures | 61 |
| Participating Medicare provider | Yes |
| Average age of these patients | 79 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)1,036 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)416 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)175 services
- Dialysis services, 4 or more physician visits per month (20 years or older) (90960)162 services
- Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month (99490)150 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Chronic kidney disease75%
- Diabetes65%
- Ischemic heart disease60%
- Heart failure58%
Hospitals where Louis D. Swartz works
Medicare's Facility Affiliation Data lists Louis D. Swartz at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Long Island Jewish Medical CenterNew Hyde Park, NY · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 330195
- Mount Sinai South NassauOceanside, NY · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 330198
- North Shore University HospitalManhasset, NY · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 330106
- St Francis Hospital - The Heart CenterRoslyn, NY · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 330182
Practice locations
Addresses where Louis D. Swartz is enrolled with Medicare (CMS data updated October 2, 2026).
- 1129 Northern Blvd, Suite 101Manhasset, NY 11030 (516) 407‑2727
- 20110 Northern Blvd, Suite 304Bayside, NY 11361 (516) 407‑2727
Group practices
Medicare enrollment lists Louis D. Swartz as a member of this group (CMS data updated October 2, 2026).
- Prine Health Medical Group, PLLC77 clinicians in the group
Specialties
- Nephrologyprimary
Other nephrologists in Manhasset
Clinicians with the same Medicare primary specialty in Manhasset, NY — not a recommendation.
Other clinicians in Prine Health Medical Group, PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1988 (38 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1619056421 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians